Instrumentation

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NEW PRODUCTS

probe's head for t e m p e r a t u r e com­ pensation, and the probe has 4-, 15-, or 25-ft. leads for field and labora­ tory a p p l i c a t i o n s . L a z a r Research Laboratories 405 ICPMS. UltraMass automated ICP mass spectrometer is computer con­ trolled for multitasking during auto­ mated r u n s and can perform u n a t ­ tended overnight analyses. Sample i n t r o d u c t i o n is e x t e r n a l to avoid t e m p e r a t u r e c h a n g e s from t h e plasma, and large peaks can be mea­ sured without damaging the detec­ tor. Varian 406

PL-GPC 110 system for GPC/SEC incorporates an Rl detector, injection valve, and columns in the air circulation oven for thermal uniformity. On-line degassing capability is included in the solvent delivery system, which accommodates flow rates of 50 μΙ_/ηιίη-5 mL/min for narrow-bore and conventional GPC columns. Polymer Laboratories 402

Instrumentation Thin-film a n a l y s i s . Aniline point apparatus performs thin-film analy­ sis for quality control of rubber sol­ vents and mixtures of aromatic sol­ vents with petroleum naphtha. The instrument, with stepless heat con­ trol, power r e g u l a t i o n , l a m p b r i l ­ liance, and pump speed, contains a thin-film test assembly with a glass sample cell, a glass pump body with a stainless steel propeller, a temper­ ature control bath, and cooling coils w i t h s e r r a t e d c o n n e c t o r s . ASTM thermometers are furnished in three ranges: - 3 8 to + 42 °C, 25 to 105 °C, and 90 to 170 °C. Precision Scientific Petroleum Instruments 401 Spectroscopy. Model 250PS paral­ lel spectrometer uses multiple opti­ cal fiber inputs to characterize emis­ sions from diffuse or heterogeneous light sources such as p l a s m a s , flames, or flows. A CCD video cam­ era for imaging resolves wavelengths

from the UV to near-IR regions, and s p e c t r a l r a n g e a n d resolution are user controlled by a t h r e e - g r a t i n g turret. Data acquisition software in­ cludes a f r a m e - g r a b b e r a n d p r o ­ cesses spectra for all channels to dis­ play 3D plots. Chromex 403 HPLC. Model LC-908 recycling pre­ parative HPLC system allows high sample loading. Partially separated components are recycled to the top of the column u n t i l adequate separa­ tion is attained, and solvent is also recycled. Isocratic or ternary gradi­ ent pump systems are available. DyChrom 404 D i s s o l v e d 0 2 . Dissolved oxygen probe DO-166 plugs directly into standard pH meters to measure dis­ solved oxygen from 0 to 14 ppm with r e a d a b i l i t y of 0.1 p p m a n d a r e ­ sponse time of < 30 s for 95% change. The probe can be calibrated in air and fits into a standard BOD bottle. A thermistor is incorporated into the

406 A · ANALYTICAL CHEMISTRY, VOL. 65, NO. 8, APRIL 15, 1993

T h e r m a l d e s o r p t i o n G C . HTD 2000 pyroprobe is d e s i g n e d to be coupled with a gas c h r o m a t o g r a p h for pharmaceutical or environmental a p p l i c a t i o n s . T h e u n i t , which h a s been modified as a m i n i a t u r e t h e r ­ m a l d e s o r b e r for s a m p l e s in t h e 100-mg range, is connected to t h e chromatograph injection port with a 1/2-in. interface t h a t heats samples to 325 °C. Samples can be desorbed onto the gas chromatograph column without pretrapping. The modified HTD 2000 can be used for t h e r m a l desorption or pyrolysis and has a se­ lectable h e a t i n g r a t e and indepen­ dently controlled interface for coil t e m p e r a t u r e s u p to 1000 °C. CDS Analytical 407 Viscometry. Quartz crystal-con­ trolled viscosity t i m e r is coupled with optical sensors and m e a s u r e s viscosity by timing the meniscus be­ tween two timing points. The timer works with standard glass viscome­ ters and compensates for accumula­ tion of dirt, discolored bath media, a n d v a r i a t i o n s in capillary walls, w i t h r e p e a t a b i l i t y to ± 1% in t h e range of 0.5-100,000 cP. Up to three switch-selectable viscometer u n i t s can be connected and timed sequen­ tially for better sample throughput and less operator attention. J u p i t e r Instrument 408 SFE. Automated SFX 3560 extractor performs unattended sequential ex­ traction and collection for up to 24

be exported to other software pack­ ages for presentation. The software also provides MW distribution aver­ ages, polydispersity, and peak apex MW, a n d c a l c u l a t e s c u m u l a t i v e weight average and fractional distri­ bution. Distribution range bound­ aries can be either automatically or interactively selected for multipoint b a s e l i n e c o r r e c t i o n of c h r o m a t o grams. Baumeister Scientific 412

Dura-Dry corrosion-resistant com­ pact freeze dryer, constructed with stainless steel vacuum tubing, dries samples at -55 °C or - 85 °C and has a 20-L ice collection capacity. Flasks and ampoules can be added on a manifold system with up to 168 drying ports. FTS Systems 409 samples in environmental, pharma­ ceutical, food analysis, or polymer analysis applications. The system uses C 0 2 for e x t r a c t i o n cycles of 15-30 min and for samples up to 10 mL. Static and dynamic extraction steps are programmable up to 10,000 psi and 200 °C. Other programmable features include fraction collection, on-line addition of modifiers for in­ dividual samples or groups, and bar code scanning. Isco 410

Software C h r o m a t o g r a p h y . C-R7A C h r o matopac data processor for chroma­ tography uses a preemptive multi­ t a s k i n g o p e r a t i n g s y s t e m for high-resolution data acquisition, processing, and output. The proces­ sor updates the C-R4A data proces­ sor with a Windows operating envi­ r o n m e n t , movable LED, and new function keys. An RS-232C and fi­ ber-optic communication interface link the C-R7A with other devices. Shimadzu 411 G P C / S E C . SEChrom v l . 0 , which runs under LabCalc software on PCs performs peak position calibration and universal calibration using ei­ t h e r M a r k - H o u w i n k c o n s t a n t s or intrinsic viscosity. Polynomial curves up to the ninth degree can be used for calibration with peaks t h a t are interactively selected from a d i s ­ played chromatogram, and plots can

Screen saver. Version 2.0 of chemSaver Windows-based screen saver is a 3D a n i m a t e d graphics display that can be customized with a library of more than 100 3D molecular struc­ tures. A dialog box provides anima­ tion, rendering, and depth cue selec­ t i o n s , and u s e r s can add new molecules to the library. Molecular Arts 413 Chemical drawing. Chemist's Per­ sonal Software Series vl.5 is an inte­ grated desktop system with ChemText word processor and chemical drawing editor; ChemBase database manager; and ChemTalk Plus com­ munications software for t e r m i n a l emulation, file transfer, and on-line database access. The molecule editor provides expanded charge and iso­ tope r a n g e s , use of biradicals and triplet radicals, and use of both radi­ cals a n d c h a r g e on one molecule. R-group searches on Beilstein and Online databases on Dialog are pos­ sible, and ChemText sketches can be converted to Windows Metafile for­ mat. The software is compatible with MS DOS 5.0, can r u n u n d e r Win­ dows or P a t h w o r k s , a n d h a s ex­ panded printer and font capabilities. Molecular Design 414

Manufacturers' Literature GC. Application note describes EPA Method 8270 for d e t e r m i n a t i o n of semivolatiles by GC and features the DB-5ms capillary GC column. Topics include inertness and resolution of critical pairs. Sample chromatograms as well as a table of GC condi­ tions and retention times are pre­ sented. 4 pp. J&W Scientific 415 Spectrometry. Three spectral inter­ pretation tutorial videotapes present a series of selected IR, NMR, or MS

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s p e c t r a to d e m o n s t r a t e specific chemical features. Principles under­ lying the techniques are discussed in the introductory sections. Each pro­ gram is more than an hour long and is accompanied by a workbook and explanatory notes. J. Huley Associ­ ates 416 GPC. B u l l e t i n No. 245 d e s c r i b e s GPC c o l u m n s w i t h t h r e e surface chemistries for s e p a r a t i n g organic and water-soluble polymers, includ­ ing organic acids and polysaccha­ rides. Chromatograms, pore size and pressure limits, MW ranges, and cal­ ibration curves are included. 12 pp. Alltech 417 P h a r m a c e u t i c a l p r o c e s s i n g . "Fo­ cus on Cartridge Filters for Pharma­ ceutical Processing" describes mem­ brane materials, filter combinations, pore sizes, construction materials, and retention ratings for the entire line of S a r t o r i u s c a r t r i d g e filters. Methods and standards for manufac­ t u r e a n d q u a l i t y control a r e p r e ­ sented, along with specification ta­ b l e s for f i l t e r s e l e c t i o n . 6 p p . Sartorius Separations 418 TOD. L i t e r a t u r e about the Model 1548 laboratory analyzer for total ox­ ygen demand describes features, typ­ ical applications, principles of opera­ tion, and instrument specifications. 4 pp. Ionics 419

Catalogs C h r o m a t o g r a p h y . Catalog lists products for analytical and prepara­ tive HPLC, high-performance biochromatography, HPTLC, and sam­ ple p r e p a r a t i o n . F e a t u r e d a r e a spherical a l u m i n a s u p p o r t for use with high-pH mobile phases, a chiral bonded β-cyclodextrin phase, and the LiChroprep direct scale-up system. EM Separations 420 SPE. Brochure details line of SPE columns, extraction discs, accesso­ ries, and processing h a r d w a r e . In­ cluded are a sorbent selection table and diagrams of SPE columns. 8 pp. Phenomenex 421 QC. Catalog for validated blind qual­ ity control checks and analytical cal­ i b r a t i o n s t a n d a r d s lists additives and kits for drinking water, waste water, and groundwater methods as well as s t a n d a r d s for hydrocarbon fuels, GC test mixtures, and individ­ ual calibration standards. Ultra Sci­ entific 422

ANALYTICAL CHEMISTRY, VOL. 65, NO. 8, APRIL 15, 1993 · 407 A